serial: 8250: allow specifying iomem size in addition to address

This adds a mapsize field to struct uart_port to be used in
conjunction with mapbase. If set, it overrides whatever value
serial8250_port_size() would otherwise report.

Signed-off-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 9b2de25359d1..e0fb5f053d09 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -2722,6 +2722,8 @@ serial8250_pm(struct uart_port *port, unsigned int state,
 
 static unsigned int serial8250_port_size(struct uart_8250_port *pt)
 {
+        if (pt->port.mapsize)
+                return pt->port.mapsize;
         if (pt->port.iotype == UPIO_AU) {
                 if (pt->port.type == PORT_RT2880)
                         return 0x100;
@@ -3553,6 +3555,7 @@ int __init early_serial_setup(struct uart_port *port)
         p->iotype       = port->iotype;
         p->flags        = port->flags;
         p->mapbase      = port->mapbase;
+        p->mapsize      = port->mapsize;
         p->private_data = port->private_data;
         p->type         = port->type;
         p->line         = port->line;
@@ -3807,6 +3810,7 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
                 uart->port.flags        = up->port.flags | UPF_BOOT_AUTOCONF;
                 uart->bugs              = up->bugs;
                 uart->port.mapbase      = up->port.mapbase;
+                uart->port.mapsize      = up->port.mapsize;
                 uart->port.private_data = up->port.private_data;
                 uart->port.fifosize     = up->port.fifosize;
                 uart->tx_loadsz         = up->tx_loadsz;